var obj={
    weight:56,
    height:180,
    sayName:function(){
        console.log('这是我的方法');
    },
    clazz:{
        class:2201,
        name:"太原理工&山西农大"
    }
};
delete obj.weight;
delete obj.sayName;
console.log(obj.clazz.name);
// 
